The document discusses how to delete duplicate songs from an iTunes music library. It describes manually removing duplicates one by one, which can be time-consuming but works for small numbers of duplicates. Alternatively, it recommends using third-party software like Leawo Tunes Cleaner, which can automatically find and remove all duplicate songs in the library with one click. The software can also fix music tags and add missing metadata. Tips are provided on streaming services, purchasing from iTunes, and backing up music libraries.